Question: "Which is {subtopic of} of {history of geography}, where {Universal Decimal Classification} is {91} ?"
Paraphrase: "Which is {subtopic of} of {history of topography}, where {Widespread Decimal Classification} is {91} ?"
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q911070 wdt:P1269 ?answer . ?answer wdt:P1190 ?x FILTER(contains(?x , '91'))}